PageBus builds on the company's core strength in enterprise messaging with a product that's "a message bus implemented in JavaScript that enables disparate Ajax elements in a Web page to broadcast and listen for events and messages published on topic names." Their contest site includes a live mashup that demonstrates PageBus via a stock selector application.

Tibco has donated the core of PageBus to the OpenAjax Alliance. As they note: "You might consider the OpenAjax Hub as a leaner version of PageBus only in so far as publish and subscribe APIs go, but richer in relation to other Ajax library interoperation infrastructure."